Lowercase cleanup improvement and added more words again.

rstat_tool/database.py

@@ -114,11 +114,16 @@ def clean_stale_subreddits(active_subreddits):
     log.info("\n--- Cleaning Stale Subreddits from Database ---")
     conn = get_db_connection()
     cursor = conn.cursor()
+
+    # Convert the list of active subreddits from the config file to a lowercase set for fast,
+    # case-insensitive lookups.
+    active_subreddits_lower = {sub.lower() for sub in active_subreddits}
+
     cursor.execute("SELECT id, name FROM subreddits")
     db_subreddits = cursor.fetchall()
     stale_sub_ids = []
     for sub in db_subreddits:
-        if sub['name'] not in active_subreddits:
+        if sub['name'] not in active_subreddits_lower:
             log.info(f"Found stale subreddit to remove: r/{sub['name']}")
             stale_sub_ids.append(sub['id'])
     if not stale_sub_ids: